Final answer:
The correct statement about the theory of evolution is that it occurs in all organisms and is supported by scientific evidence, encompassing both natural selection and genetic mutations, without intentionality.
Step-by-step explanation:
The statement that aligns with the theory of evolution is the one that acknowledges it as a process that occurs in all organisms, not just mammals. This includes prokaryotes and continues to take place over time, shaping life through natural selection and genetic mutations. Evolution is the unifying theory of biology, providing a framework that is supported by a wealth of scientific evidence. It is not a process directed only at achieving perfect adaptation or only affecting certain groups of organisms; rather, evolution can produce changes that are non-intentional and sometimes result in adaptations.
Furthermore, the theory of evolution allows us to understand major events in the history of all life on Earth, not just mammals. It emphasizes that while natural selection is a significant force, it does not 'create' traits — it can only select for traits that have arisen due to mutations and other sources of genetic variation.
Lastly, it is essential to clarify that evolution does not occur because organisms 'want' or 'intend' to evolve; it is a natural process that results in certain phenotypes being more successful in given environments and thus becoming more prevalent in a population over time.